During a flight, a remote pilot observes another aircraft that shows no lateral or vertical movement relative to the horizon but appears to be growing in size. What does this indicate?

Question

Accepted Answer

The aircraft is likely on a collision course: no relative angular movement combined with increasing size means the two aircraft are converging. An aircraft that shows no lateral or vertical movement in the pilot's field of view but is increasing in apparent size is closing distance directly toward the observer. There is no relative angular motion because both aircraft are on converging tracks. FAA guidance in AC 90-48D states that if another aircraft appears to have no relative motion but is increasing in size, immediate evasive action is required.

Answer

The aircraft is flying parallel to the drone's path and will pass safely to one side

Answer

The aircraft is in a gradual climb and will pass above the drone